Burnout Paradise - Depends of you like the series then maybe its worth buying
Tekken 6 - yes
Soul Calibur 4 - yes
Killzone 2 - yes
GT5 - hell yes
Assassin's Creed - hell no! save your money don't buy this crap.
Btw i saw you already got COD4 and GTA4 both great games with awesome multiplayer.
I got both also, so if your interested in playing some time just add my psn id: Xephon_
(just remember to write pakgamers.com or something in the msg)